Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a3773715cdf5876…

MALICIOUS

PDF

78.4 KB Created: 2021-03-30 03:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6a0bbc097560b0496ad26dab476129e0 SHA-1: 5d939f58d4c818c176c807407b099409c05229d4 SHA-256: 0a3773715cdf5876a384c4bf6091db1aa0cabb63394d1d11d20b0d29d4ed3c3e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://zajinet.ru/strik?utm_term=washington+wizards+players PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4502248/normal_6027f0d40c21a.pdfIn PDF document text
    • http://vifijes.22web.org/outlaw_king_rating_parents_guide.pdfIn PDF document text
    • http://wenukitabozuv.22web.org/resumen_del_libro_el_seor_de_las_moscas_capitulo_2.pdfIn PDF document text
    • https://binufigelivu.weebly.com/uploads/1/3/4/7/134775083/5233248.pdfIn PDF document text
    • https://jagefebasedi.weebly.com/uploads/1/3/5/9/135993187/rusatinusifaj.pdfIn PDF document text
    • https://gokulibom.weebly.com/uploads/1/3/4/2/134266198/kodakizovufutovimiva.pdfIn PDF document text
    • https://balolemarivapi.weebly.com/uploads/1/3/5/3/135309218/62267d0a4351294.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454425/normal_605dc497ee627.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8909b315-4d59-4940-aabf-0fdaa532e0ad.filesusr.com/ugd/4542d9_9db9e351bbda4dd7b532eab393035efc.pdf?index=trueIn PDF document text
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_851a72030f6e41f9aa54eb7894557ff7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/ecoutez_bien_1_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/amazon_fire_phone_firmware.pdfIn PDF document text
    • http://juwebud.epizy.com/vehicle_registration_information_kerala.pdfIn PDF document text
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_47189701d039474881bdd4f0f6d35806.pdf?index=trueIn PDF document text
    • https://12a3aa02-022d-4218-8efb-90aa4388683d.filesusr.com/ugd/6dfd9b_ce181813219943b5846a9a6dab57655a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/advanced_engineering_mathematics_course_online.pdfIn PDF document text
    • http://dojagosixotebut.rf.gd/aims_of_sentencing_retribution.pdfIn PDF document text
    • https://46a1ac71-481d-4a85-b709-d40f3a189542.filesusr.com/ugd/143c98_a31341982f644c9a83e3d59045db0420.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/simujix/18716773427.pdfIn PDF document text
    • https://ab737b70-891a-4a1f-8db9-ee548211cb31.filesusr.com/ugd/ce14f3_4e69530ddb9e4064b61ebedc17e863f0.pdf?index=trueIn PDF document text
    • http://beposutixavi.epizy.com/84744311494.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/427232073.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF245 5476 bytes
SHA-256: 7a55f15a292d48e8f5ebdc1acb3f1d8a7327a7f8f5256478c6d2b2e7b2182137
font_01_sfnt_off00010504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10504 12692 bytes
SHA-256: 2840aefc32ac4aa6d8fd2c83d9b695f9e5be098324dc865d9704534b52f2f559

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